Cryptic crossword clue
Extraordinary pattern designed with a ruler 13

The most common and most likely answer to this crossword clue is the 13 letter word PRETERNATURAL

I've seen this crossword clue in The Daily Telegraph
P
R
E
T
E
R
N
A
T
U
R
A
L

Buddy explains!

The straight part
We know that "Extraordinary" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extraordinary = preternatural.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does PRETERNATURAL mean?

PRETERNATURAL adjective
  1. Beyond or not conforming to what is natural or according to the regular course of things; strange.
  2. Having an existence outside of the natural world.

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